Compound engine.



No. 757,965. l PATBNTBD APR. 19, 1904. s. RUTHSCHILD. GOMPOUND ENGINE.

APPLICATION FILED JULY 20, 1903.

No. 757,965. PATENTBD APR. 19, 1904.

S. ROTHSCHILD.

GOMPOUND ENGINE. APPLICATION PILBII JULY 20, 1903. NO MODEL. 3 SHEETS-SHEET 2.

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GOMPOUND ENGINE.

APPLICATION FILED JULY zo, 190s. No MODEL. a SHEETS-SHEET a.

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UNITED STATES Patented April 19, 1904.

PATENT OFFICE.

COMPOUND ENGINE.

SPECIFICATION forming part of Letters Patent No. 757,965, dated April 19, 1904.

Application led July 20, 1903. Serial No. 166,253. (No model.)

To all whom t may concern,.-

Be it known that I, SIDNEY ROTHSCHILD, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Compound Engine, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved compound engine which is simple and durable in construction, very compact, easily started and reversed, and arranged to utilize the motive agent to the fullest advantage.

The invention consists of novel features and parts and combinations of the same, as will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a longitudinal sectional elevation of the improvement. Fig. 2is a similar view of the same, showing the starting device in action to admit live motive agent into the low-pressure cylinder. Fig. 3 is a like View of the same, showing the exhaust of the steam from the low-pressure cylinder and the admission of live steam to the high-pressure cylinder. Fig. 4 is a cross-section of the improvement on the line 4. 4 of Fig. 1, and Fig. 5 is a similar view of the same on the line 5 5 of Fig. 1.

In the low-pressure cylinder A is mounted to reciprocate a cylinder-piston consisting of a low-pressure piston B and a high-pressure cylinder Bl of the usual reduced size relative to the low-pressure cylinder A.

The cylinder-piston B B is provided with a piston-rod B2, having a cross-head B2, connected in the usual manner with the main shaft of the engine, the said piston-rod B2 passing through suitable stufHng-boxes on the inner head A of the cylinder A. The cylinder-piston B B is moved in a forward directionth atis, in the direction of the arrow LQ-by the pressure of the live steam, while the return movement of the said cylinder-piston in the inverse direction of the arrow a is produced by the exhaust-steam from the cylinder B passing into the cylinder A, between the head Al and the piston B. For the purpose mentioned the high-pressure cylinder Bl contains a thimble O, mounted to slide in the said cylinder and arranged to slide on the inner end of an inlet D, secured to an outer cylinderhead A2 and projecting a distance into thelowpressure cylinder A, as plainly shown in the drawings.

On the top of the cylinder A is arranged a steam-chest E, connected by a pipe F with a boiler or other suitable source of motive-agent supply, and in the said steam-chest Eis mounted to reciprocate a slide-valve G, for controlling ports c and b, of which the port a; connects with the inlet D and the other port, b, leads into the cylinder A adjacent to the cylinder-head A.

An intermittent reciprocating motion is given to the slide-valve G from the cross-head B2, and for this purpose the slide-valve G supports a cylinder G, in which reciprocates a piston G2, held on a piston-rod G3, extending to the outside of the steam-chest and connected with a cross-head G4, mounted to slide on suitable bearings G5, as plainly shown in Fig. 1. The cross-head G4 is connected with an arm G6, attached to the cross-head B3, so that when the latter reciprocates a like movement is given by the arm G to' the cross-head G4, and hence to the piston-rod G3 and the piston G2, whereby the latter travels in the cylinder G and alternately abuts against the ends thereof to shift the cylinder, and with it the slide-valve G, alternately into right-hand and left-hand positions, as illustrated in Figs. 1 and 3.

In the slide-valve G are arranged ports c, d, and e and a cavity f, and on the said slidevalve over the said ports is arranged a starting-valve H, normally held in an immovable position,relative to the slide-valve G, and in this starting-valve H is arranged a port /L and a cavity g. Y

Now when the several parts are in the position shown in Fig. 1 then the live motive agent which pushes the cylinder-piston B B' into the inward position is free to escape from the cylinder B by way of the thimble C, inlet IOO D, ports a and ZZ, cavity g, and ports c and Z into the right-hand end of the cylinder A to act on the piston B, so as to return the latter in the inverse direction of the arrow d by the expansive force of the steam. Now when the cylinder-piston B B is on this return stroke then the thimble C telescopes in the cylinder B and on the inlet D, as plainly shown in Fig. 3', and as the slide-valve G is now shifted to the position shown in Fig. 3 it will be seen that live motive agent cannow pass from the steam-chest E by way of the ports it, o, and a into the inlet D, so that the live steam passes 'into the cylinder B to push the latter and its piston B in the direction of the arrow a. The exhaust-steam in the low-pressure cylinder A in front of the piston B now passes out by lway of the port Z, a branch port Z', the cavity f, and an exhaust-port t', which latter conducts the exhaust motive agent to the atmosphere. (See Fig. 5.) f

Now from the foregoing it will be seen that the low-pressure cylinderA not only contains the low-pressure piston, but also the highpressure cylinder, and by having the thimble C telescoping in the cylinder B and on the inlet D. it is evident that the usual full long stroke of the engine is obtained.

In starting the engine it is necessary to temporarily admit live motive agent into the lowpressure cylinderA by way of the port Z, (see Fig. 2,) and for this purpose the valve H is shifted from its normal position to that shown in Fig. 2, so that the live motive agent in the steam-chest E can pass by way of the ports c and the branch port Z2 into the port Z and to the cylinder Ato push the cylind er-piston B B in the inverse direction of the arrow a. It is understood that if the cylinder-piston B B is at rest in the outermost position shown in Fig. 3 then it is not necessary to shift the valve H, as live motive agent can then pass into the high-pressure cylinder whenever the steam is turned on by opening the usual valve in the pipe F.

The valve H is provided with a shifting mechanism arranged as follows: On the valve H is a stem H', extending into a cylinder I, formed or secured on the outer head of the Steam-chest E, and in this cylinderl is mounted to reciprocate a piston H2, attached to the outer end of the stem H. A valved steampipe J leads to the cylinder I, at the inner end thereof,so that when steam is turned on in the pipe J it passes into the cylinder I and pushes the piston H2 outward, so as to shift the valve H from its normal position, las shown in Figs. l and 3, to that shown in Fig. 2, to uncover the port c for the motive agent in the steam-chest E to pass by way of the said port and the branch port Z' into the port Z and nally into the low-pressure cylinder A to push the piston B in the inverse direction of the arrow a. A spring Kpresses against the outer face of the piston H2, so as to move the latter inwardly when the steampressure in the pipe J is shut off and it is desired to return .the valve H to its normal position. The cyl- G is shifted, and for this purpose the following device is provided: On the outer end of the cylinder Gr of the slide-valve G is secured a piston-rod L, extending through the outer head of the steam-chest into a cylinder O, containing a piston N, attached to the piston-rod L, and into the cylinder open ports Zt and Z, leading' from a steam-chest P, provided with a steam-supply pipe Q, having a valve Q', which when opened admits steam to the steamchest P. Now when the slidevalve G is in the position shown in Fig. l then the live steam from the steam-chest P passes by way of the port 7c into the inner end of the cylinder O to push the piston N therein outward to shift the slide-valve G in a like direction, thus reversing the valve, and consequently the engine, and when the valve G at the time of admitting steam into the chest P is in the po- Sition shown in Fig. 3 then the live motive agent passes from the steam-chest P by way of the port Z into the outer end of the cylinder O to push the piston N therein inward, and thus move the valve G in a like direction, thereby reversing the valve, and consequently the engine. The exhaust' steam in front of the piston N is conducted by the corresponding port Z or 7c and a slide-valve R to an exhaust-port n., leading to the outside. Thus in order to enable the operator to reverse it is only necessary for him to open-the valve Q temporarily for causing a shifting of the valve G, no matter in what position it is at the time, so that the engine is reversed.

In order to relieve the high-pressure cylinder B of any water of condensation, a Vreliefvalve S is provided, preferably located in the low-pressure piston B, at the lower portion thereof. A f

Having thus described my invention, I claim as new and desire to secure by Letters Patent-'- 1. A compound engine having a low-pressure cylinder, a cylinder-piston reciprocating therein and having a headat one end and open at the other end, the cylinder-piston forming the high-pressure cylinder and the head forming the piston-head for both the high and low pressure cylinders, and means for conducting the motive agent into the open end of the highpressure cylinder, to move the cylinder-piston in one direction and to subsequently conduct the motive agent from the said high-pressure cylinder into the low-pressure cylinder, as set forth.

2. A compound engine having a low-pres- 7o In order to reverse the engine the slide-valve l Ioo IIO

IZO

sure cylinder, a cylinder-piston reciprocating therein and forming the high-pressure cylinder and the piston for both the h lgh and low pressure cylinders, a movable thimble inthe said cylinder-piston, and means for conducting the motive agent into the high-pressure cylin der, to move the cylinder-piston in one direction and to subsequently conduct the motive agent from the said high-pressure cylinder into the low-pressure cylinder, as set forth.

3. A compound engine having a low-pressure cylinder, a cylinder-piston reciprocating therein and forming the high-pressure cylinder and the piston for both the high and 10W pressure cylinders, a fixed inlet projecting into one end of the low-pressure cylinder, a movable thimble slidable in the cylinder-piston and on the fixed inlet, and means for conducting the motive agent into the said inlet and from the latter to the low-pressure cylinder, as set forth.

4c. A compound engine having a low-pressure cylinder receiving the motive agent at one end, and a cylinder-piston reciprocating in the low-pressure cylinder and receiving the motive agent through the other end of the low-pressure cylinder, the said cylinder-piston forming the high-pressure cylinder and the piston for both the high and low pressure cylinders, as set forth.

5. A compound engine having a low-pressure cylinder receiving the motive agent at one end, a cylinder-piston reciprocating in the lowpressure cylinder and receiving the motive agent through the other end of the low-pressure cylinder, the said cylinder-piston formd ing the high-pressure cylinder and the piston for both the high and low pressure cylinders, and a valve mechanism for controlling the motive agent to the said cylinder-piston and to conduct it from the latter to the low-pressure cylinder, as set forth.

6. A compound engine having a low-pressure cylinder receiving the motive agent at one end, a cylinder-piston reciprocating in the lowpressure cylinder and receiving the motive agent through the other end of the low-pressure cylinder, the said cylinderpiston forming the high-pressure cylinder andthe piston for both the high and low pressure cylinders, a valve mechanism for controlling the motive agent to the said cylinder-piston and to conduct it from the latter to the low-pressure cylinder, and a starting-valve for the said valve mechanism, under the control of the engineer, to temporarily admit high-pressure steam into the low-pressure cylinder, as set forth.

7. A compound engine having a low-pres sure cylinder receiving the motive agent at one end, a cylinder-piston reciprocating in the lowpressure cylinder and receiving the motive agent through the other end of the low-pressure cylinder, the said cylinder-piston forming the high-pressure cylinder and the piston for both the high and low pressure cylinders, a valve mechanism for controlling the motive agent to the said cylinder-piston and to conduct it from the latter to the low-pressure cylinder, and a reversing mechanism for the said valve mechanism, as set forth.

8. A compound engine having a low-pressure cylinder receiving the motive agent at one end, a cylinder-piston reciprocating in the lowpressure cylinder and receiving the motive agent through the other end of the low-pres sure cylinder, the said cylinder-piston forming the high-pressure cylinder and the piston for both the high and low pressure cylinders, a valve mechanism for controlling the motive agent to the said cylinder-piston and to conduct it from the latter to the low-pressure cylinder, and a reversing mechanism for the said valve mechanism, comprising an auxiliary cylinder, a piston therein, connected with the valve mechanismand an auxiliary valve for controlling the admission and exhaust to and from the said auxiliary cylinder, as set forth.

9. A compound engine having a low-pressure cylinder receiving the motive agent at one end, a cylinder-piston reciprocating in the lowpressure cylinder and receiving the motive agent through the other end of the low-pressure cylinder, the said cylinder-piston forming the high-pressure cylinder and the piston for both the high and loW pressure cylinders, a valve mechanism for controlling the motive agent to the said cylinder-piston and for conducting it from the latter to the low-pressure cylinder, a starting-valve for the said valve mechanism, under the control ofthe engineer, to temporarily admit high pressure steam into the low-pressure cylinder, the said starting-valve having a valve-stem, carrying a piston, an auxiliary steam-cylinder in Which reciprocates the said valve-stem piston, and a spring pressing the said valve-stem piston in one direction, as set forth.

l0. A compound engine having a low-pressure cylinder provided With ports, a cylinder piston reciprocating in said low-pressure cylinder and forming the high-pressure cylinder and the piston for both the high and loW pressure cylinders, an inlet projecting into one end of the low-pressure cylinder, one of the ports of the low-pressure cylinder being connected With said inlet and the other port leading into the other end of said low-pressure cylinder, a telescopic connection between the cylinder-piston and the said inlet, and a valve mechanism for controlling said ports, as set forth. Y

In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

SIDNEY ROTHSCHILD.

Witnesses:

. HARVEY FLEMING,

HARRY ROTHSCHILD.

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